Concrete-mold.



W'. D. HORNING.y

CONCRETE Mom. APPLICATION FILED DEC9| |913- HENEWED MAY-9| |917.

' x Patented-M1371?, 1917.

' effective means for stripping the mold mem.

WALTER n. HOENING, or MILWAUKEE, WISCONSIN.

d CONCRETE-MOLD.

Maaate. j

Speciication' of Letters Patent.

Patented. July 1"?, 191 'If'.

Application filed neeembere, 1913, serieu No.V 805,572. Renewed May 9, 1917. serial No. 167,580.

To all whom t may concern:

Be it known that I, WALTER D. HORNING, a citizen of the United States, and resident of Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented cer-` tain new and useful Improvementsin Concrete-Molds, and I do hereby declare that the following` is afull, clear, and `exact description thereof.

.Y My invention refers to two-part molds for forming concrete pipe sections, the object being lto provide a simple, economical and bers from the completed `pipe and for: locking up said mold members. i With the above objects :in view the invention consists in certain peculiarities of constructionf and combination of parts as set forthl hereinafter with reference to the accompanying drawings and subsequently claimed.

'In the drawingse- Figure 1 represents a side elevation ofa tion;

Fig. 2, a sectional elevation of the same, thesection being indicated by line 22of "-F ig. 3, a `cross-section of the mold, the section being indicated byline 3-3 of Fig. 2, said crossfsection illustrating the` mold in its locked position and containing a pipe section;y i C Fig. 4, a cross-section of the mold showing the same partly open preparatory `to stripping the completed pipe therefrom,;and Fig. 5, asimilar cross-section of the partly Open'mold illustrating the position assumed by the stripper-plates prior to the `molded pipe section being removed'. A

Referring by characters to the drawings, 1, l, represent the two-part members of a mold, which together-form a drum constituting thebody of 'saidmold The` upper edges ofthe mold members are capped by liared semi-circular heads 2, 2, andthe lower edges are similarly 4capped by reinforcing angle-iron bands 3, 3. f The transverse edges ofV eachmoldmember are reinforced by angle-iron strips 4,4, 4', 4, the radial webs of which strips abut each other mold embodying the features of my inven-` 7 to form tight joints when the mold members closed, the links 6 are adapted to seat into` registered notches 6 that are formed in the radial flanges of the abutting angle-iron stay-strips 4, 4. In this locked position the bar 7 is nested parallel with the longitudinal stay-strips juxtaposing the mold-section 1. Locking of theclosed form is effected by set- Screws'S that pass through the bars, 7 `and abut the adjacent flange `of the angle-iron strip 4, the said set-screws constituting adjustable bail-engaging feet.

. As best shown in Fig. 3, when the form is locked, the draw of the links 6 relative to the point of Contact of the bail-engaging feet, is to one side of an imaginary line intersecting the pivot-point of said links and hence the draw upon the oscillatory strip 7 is inwardly disposed. This inward movement of the bar, however, is limited by engagement of the end of a handle 9, `which handle is rigidly secured to said bar.`

While I have described one of the mechanisms for locking the two-part `mold `together, it should be understood that both ,joints of saidmold are provided with similar locking mechanisms as indicated in Fig. j

2 ofthe drawings. Y c j j From the foregoing description it is obvious that when the mold members are regis` tered, the operator swings the locking mechanisms across the joint, whereby the engaging feet or set-screws 8 will come in contact with the flange of the angle-iron strip 4 and to lock up the mold a slight oscillatory movement of the i handle 9 inwardly will cause the set screwpoints of the center of draft, wherebythe strain upon the links will hold the lockingmechanism in the position shown in Fig. 3.

It is also obvious that, by adjusting the contact to pass the fact that 1t requires'. considerable force ito separate the mold surfaces from the pipe section and to overcome the above-referredto objectionable features, I provide each mold member with a thin sheetanetal circular strippingplate l0. lThese strippingpl'atesare'adaptedto nest against the inner walls of' the moldn-iembers and exten-d to a point adjacent to their longitudinal edges, as `best shown in 3. rrElie strippingplates haveV a certain percentage ofelas- :ticity and, when in their normal position,

they assume a curve of less curvature than themold section into which they are fitted, which normal shape is shown in F ig. 5 of the drawings.` Each circular strippingplate 10 is arranged to have transversely disposed sliding playf within its mold member ari-disconfined by a bail l1, which bai-l has inturned arms ll" extending' through slots that are formed in the 'body olf the mold'V member. The ends ofl these arms are riveted `orotherwise secured to the stripping-plates, it being understood that the bail is thus arranged in'slidable'union with the mold-memberand positioned centrally with relation toits edges.4 By this arrangement the `operator can conveniently manipulate the stripping-platesv from the outside of-` the mold-membersy when the latter are expanded. Asshown in Fig. 3, when a pipe section is being-molded, the mold-members are closed about a hollow core 12, which core forms no part of my present invention, and thereafter the concrete material is poured to; form the hollow tile or pipe section and prior to pouring the materia'hit is understood that the stripping-plates are drawn outwardly by their respective bails tov cause them to-l nest snugly against the inner faces of their respective mold-members. After the pipe section has been completed and the material is set, the mold-members vare separated as hown in Fig; 4. Thus it will be seen that only a small surface of' each mold-member isstripped from the surface of the green pipe section just formed. ln this operation the stripping-plates serve as a guard and will adhere to the faces'of the pipe section causes.. the outer surface of the pipe. section due to adhesion and the length of the arms l1 of the bails will thus permit movement of the mold-members independent of said stripping-plates. The next operation is to remove. the stripping-plates and this is effected by exerting downward pressure, which pressure isap lied to the bails, causing. them to play in the shell slots. The effect ofthe pressure applied at the center of thestripping-plates will cause the outer edges of the same to move slightly away from the surface of the pipe section, whereby air is admitted to thus break the vacuum and the said stripping-plates will then assume their normal positions, as shown in Fig-l 5, or, in` other Words, their free edges wilt gradually spring away from the surface of the pipe.

Ags. shown in Figs. l and l, in order to lock the spring. metal stripping-plates in nested engagementy with the molds, the bails 11 may be provided with eccentrics. 12, whereby a positive drawing lock is eected.

I' claim :5

1.-.'li`heV combinationy of a twofpart. moldmember.- having apertures therein, bail-arms extending through the apertures, and a ilexible stripping-plate. carried by the, bail-arms adapted: to conform to. the inner surface of thev moldfmembers..

2. rlPhe combination of a pair of semicircular mold-membersA having apertures. therein, a bail for each Vmold member pro.-

vided with arms in slidable union with they apertures of said mold member, an arcuate resilient stripperl plate secured to the. arms of'. each bail member, the stripper-plates being normally of less curvature than the mold members.. 3. The combination of1 a pair of semicireular mold members having apertures therein, a :bail for. each mold member provided with arms in slidable. union with the apertures, an arcuate resilient. stripper-plate securedto; the` arms` of each bail, the stripper-plates being normally of less curvature than the mold member, and means carried by each bail member engageable with the outer face of its associated mold member for drawing its related strippenplate into engagement with the inner face of the aforesaid-mold member.

4. In combination, a mold member having a concave surface, a resilient stripper. plate movablxyy mounted said mold memberand adapted to fit against and conform to. said concave surface, said stripper plate tending to assume a shape of less curvature than that ofi such concave surface, and means. for causing said.: stripper plate to conform to and it against said concave surface.

51 mold, comp-rising a combination of a plural-ity of mating mold members having coperatingI concave surfaces, resilient stripper plates movably mounted in said mold have hereunto set my hand at Milwaukee in members to form the molding surfaces and the county of Milwaukee and State of Wis- 10 tending to lssume a siape of diifernt curva cousin in the presence of tWo Witnesses. ture from t at of sai concave sur aces, an

5 means for causing said stripper plates to WALTER D' HORNING' independently conform to and t against Witnesses: said concave surfaces. GEO. W. YOUNG In testimony that I claim the foregoing I M. E. DOWNEY.

Copies of this patent may be obtained for live cents each, by addressing the Commissioner of Patents, Washington, D. C. 

